$html = <<<'HTML'
<body>
<main>
<div>
Lorem ipsum dolor sit amet consectetur adipisicing elit.
</div>
<p>
Incidunt expedita laudantium aliquid unde explicabo.
</p>
<span>
Velit eveniet alias minima vitae libero labore.
</span>
</main>
</body>
HTML;
$dom = new DOMDocument;
@$dom->loadHTML($html, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);
$xpath = new DomXPath($dom);
$entry = $xpath->query('//main/node()');
$content = '';
foreach($entry as $element) {
$content .= $dom->saveHTML($element);
}
/////////////////////////////////////////////////////////////////////////////////
// Как дальше искать внутри переменной «$content» (без xPath) ?
/////////////////////////////////////////////////////////////////////////////////
$subcontent = '';
foreach($content->getElementsByTagName('*') as $node) {
$subcontent .= $dom->saveHTML($node);
}
echo $subcontent; // не работает
$subcontent = '';
@$dom->loadHTML($content, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);
foreach($dom->getElementsByTagName('*') as $node) {
$subcontent .= $dom->saveHTML($node);
}
echo $subcontent;